Mining drill and bit



Feb. 6, 1934. F, w. VODOZ MINING DRILL AND BIT Original Filed March 10, 1930 127061 or I flco'crirk Z! 0402 Patented Feb. 6, 1934 PATENT OFFICE 1,945,711 MINING DRILL AND BIT Frederick W. Vodoz,

Wilmette, Ill., assignor to Goodman Manufacturing Company, Chicago, 111., a corporation of Illinois Application March 10, 1930, Serial No. 434,500 2 Renewed November 18,

9 Claims.

My invention relates to improvements in mining drills and bits therefor, and has among other objects to provide an efiicient, durable and inexpensive drill including a new and improved bit and a simplified means for detachably connecting said drill bit thereto.

Mining drills or augers have been formerly made in one piece with the bit forged integral therewith. When the bit becomes dull it is necessary to remove the entire drill or auger from the mine to sharpen the bit. It is advantageous to provide a mining drill with a removable bit so that it is only necessary to remove the bit from the auger when dull and replace with a sharp bit. My invention herein relates to a new and improved mining drill having means for guiding the drill within the hole and conveying the cuttings away from the hole and an inexpensive, simple and 'effective means for holding a bit thereto.

Other objects of my invention will appear from time to time as this specification proceeds. 7

My invention may be more clearly understood with reference to the accompanying drawing wherein:

Figure 1 is a perspective view of the invention with parts in section showing the means of holding the bit to the drill shank;

Figure 2 is a perspective view of the invention with parts in section showing the bit in a difierent position than is shown in Figure 1;

Figure 3 is a front end view or" the bit and bit holder;

Figure 4 is an enlarged perspective view of the bit used in my invention;

Figure 5 is a perspective view of a modified form of my invention with parts in section;

Figure 6 is a front end view of a modified form of bit and bit holder; and

Figure 7 is an enlarged perspective view of a modified form of bit.

Referring now in particular to the drawing, the device embodying my invention includes a drill shank 10 having a means thereon for guiding the drill as it is drilling in a mine wall and for conveying the cuttings away from the bit, which means is herein shown as a spiral conveyor ribbon 11 extending along the shank 10 for a distance equal to substantially its entire length and having a diameter substantially equal to the diameter of the hole to be drilled so said conveyor may guide the drill within the hole and convey the cuttings away from the hole. The shank 10 may be of any form but is herein preferably shown as being hollow and has suitable means (not shown) on the rearward end thereof to hold the drill to a suitable drilling device. p

A suitable means is provided at the forward end of the drill shank 10 for holding a bit in position for drilling in a mine wall. Said means as herein shown comprises a bit holder 12 held in the drill shank 10. The bit holder 12 may be held to the drill shank 10 by any suitable means well known to the art. As herein shownjthe shank 10 is preferably shrunk on the bit holder 12. The bit holder 12 extends beyond the for: ward end of the drill shank 10 and has threads cut on its inner periphery which are herein preferably shown as square threads 13. The forward end of the bit holder 12 is provided with a plurality of radial V shaped notches 14 adapted to be engaged by a portion of a bit 15 to lock said bit in position in the bit holder 12 in a manner which will hereinafter be more fuly described.

The bit 15 may be of any type well known to the art, but is herein shown as a fish tail type of bit, and has a plurality of cutting edges 16 extending forwardly from a stock 1'7. A tongue 18. projects rearwardly of the stock 17 and has 'a saw cut 19 extending through its central portion, which cut is perpendicular to the face of the stock 17. One end 20 of the tongue 18 is bent It may thus be seen that the outwardly extending ends 20 and 21 of the tongue 18 may ell-,- gage the square threads 13 on the inner periph cry of the bit holder 12 and that the bit 15 may be threaded therein. The radial V shaped notches 14 are engaged by the ears 23 extending from the stock 17 of the bit 15 to lock and hold said bit from rotation in the bit holder 12 and preventwabbling of said bit as a hole is being drilled in a mine wall. It may also be noted that the threads 13 are cut so that the bit will be tightened in the holder as it enters the mine wall.

Figures 5, 6 and '7 show amodified form of bit 24 and show a modified way of fixing the tongue of the bit so it may be threaded into a bit holder. A bit holder 25 is provided and held within the drill shank 10 in any suitable manner. The bit holder 25 is similar to the bit holder 12 with the exception that it is not provided with the radial V shaped notches 14. The bit 24 is provided with cutting edges 26 and a stock 2'7 and has a tongue 28 projecting rearwardly therefrom.

Each edge of the tongue 28 has grooves 29 formed therein which leave teeth BOprojeeting outwardly from each side of the tongue 28, The teeth 30 are alternately inclined in opposite directions with respect to each other and the tooth 30 on one side of the tongue 28 is opposite the groove 29 on the opposite side of said tongue so that said teeth correspond to threads 31 out within the bit holder 25 and so that the tongue 28 may be threaded therein;

It may herein be seen that a new and improved form of drill has been provided having a new and improved means for holding a bit on a drill which means is effective, simple and inexpens sive to manufacture so that the bits may be held firmly in the shank while drilling or quickly reme d t r om when d ll- While I have shown herein. and described one form o my on, .1 d n Wi h to h limit to the precise details of construction, or arrangemen f parts he ein sh wn and describ d ce t g as sp ifi al y im t d in th app n d claimsclaim s y ve tio 1 In combination with a mining drill, a shank having an intern lly thr ade fo wa portion, a. bit having a stock, cutting edges projecting for wa d y her from. nd m an for ho ding said bit w hin s id sha k c mpr sin a tongue pr jecting rearwardly from said stock and a plural ty 0 p eie s extend ng outwardly om he end o said ngue n pp i d rections ad pt d. t e a h threads in the internally th eade portion of a d hank,

2.. In com n t on it a mining drill, a shank having an in rna y h eaded. for a port o a hit. hav a to k cut in e ge pr ieeti c ior nr y th re m m ans o o ing s i bi w h n. i an c mpr sing a tongu projecti r a w dl fr m sa d ock and a plu a ity oi pro ec ions ext nd n o tward y from he end of said t ngu in e os tedireeti s adapted to enga t thr ads i he nternally th ad d por n f s i s a k, d m ans t h ld said. b from rotation with respect to said shank com? p is n a p ra it of ad a ndtehes n t fo Wd i nd of said shan an a p a ity f ars n egral w th ai stock. 0 ngagem nt ith a d notc es.

V 3. In combination with a mining drill, a shank havin an int al y th ead d forw d po tion, a bit having a stock, cutting edges projecting or ardly ther from, m ans f r oldi sa bit it in. aid shank omprisin a gue pro ect g ea war ly from said toc nd. a-plur ity f proj ct on ext nding ou ardl r m the end of said tongue in opposite directions adapted to, enga h threads n he inter all t r aded ner en o id shank, and means t hold sa d hit from rotation with respectto said shank comsin a plurality of ad a n tehe 'en the ward nd o said. an and apln ality of ars extending ang larly rearwardly in opposite directions from said stock for engagement with said notches.

4. In combination with a mining drill, a shank having an internally threaded forward portion, a bit having a stock, cutting edges projecting forwardly therefrom, and means for holding said bit within said shank comprising; a tongue prowbit, having a stock, cutting edges projecting forjecting rearwardly from said stock and having a plurality of integral projections formed thereon and extending outwardly therefrom in opposite directions for engagement with the threads in the internally threaded portion of said shank and said stock having engagement with the forward face of said shank.

5. In combination with a mining drill, a shank having an internally threaded forward portion, a

wardly therefrom, and means for holding said bit Within said shank comprising a split tongue projecting from said stock having ends extending in opposite directions for engaging the internally threaded portion of said shank.

6. In combination with a mining drill, a shank having an internally threaded forward portion, a bit having a stock, cutting edges projecting forwardly therefrom, means for holding said bit within said shank comprising a tongue projecting forwardly from said stock and a plurality of integral projections formed thereon and extending outwardly from said tongue in opposite directions adapted to engage the threads in the internally threaded portion of said shank, and means to hold said bit from rotation with respect to said shank comprising a plurality of radial notches on the end of said shank adjacent said bit, and an ear integral with said stock extending therefrom for engagement with one or the other of said notches.

7. In combination with a mining drill, a shank having an internally threaded forward portion, a bit having a stock, cutting edges projecting forwardly therefrom, means for holding said bit within said shank comprising a tongue projecting rearwardly from said stock and a plurality of integral projections formed thereon and extending outwardly from said tongue in opposite directions adapted to engage the threads in the internally threaded portion of said shank, and means to hold said bit from rotation with respect to said shank Comprising a plurality of radial notches on the end of said shank adjacent said bit and an ear extending angularly rearwardly from said stock for engagement with said notches.

8. In combination with a mining drill, a shank having an internally threaded forward portion,

a bit having a stock, cutting edges projecting forwardly therefrom, and means for holding said bit within said shank comprising a split tongue projecting from said stock having ends extending in opposite directions for engaging the internally threaded portion of said shank and means for holding said bit from rotation with respect to said shank comprising a plurality of radial notches on the end of said shank adjacent said bit and an ear integral with said stock for engagement with one or the other of said notches.

9. In combination with a mining drill, a shank having an internally threaded forward portion, a b t havin a ock, t in e p jectin f rwardly therefrom, and means for holding said bit within said shank comprising a split tongue projecting from said stock having ends extending in opposite directions for engaging the internally threaded portion of said shank and means for holding said bit from rotation with respect to said shank comprising a plurality of radial notches on the end of said shank adjacent said bit and an ear extending angularly rearwardly from said stock for engagement with one or the other of said notches.

FREDERICK W. VODQZ. 

